feat: basic database model

Program.cs

@@ -1,5 +1,14 @@
+using Microsoft.EntityFrameworkCore;
+using QuotifyBE.Data;
+using QuotifyBE.Entities;
+
 var builder = WebApplication.CreateBuilder(args);
 
+// Configure Database Conecction
+var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
+builder.Services.AddDbContext<ApplicationDbContext>(options =>
+    options.UseNpgsql(connectionString));
+
 // Add services to the container.
 
 builder.Services.AddControllers();
@@ -12,6 +21,7 @@ var app = builder.Build();
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
+    app.UseMigrationsEndPoint();
     app.UseSwagger();
     app.UseSwaggerUI();
 }